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Engine Valves / Guides / Springs
By OE Match
- Porsche 993 (911) C2 1994-97
- Porsche 993 (911) C4 1994-97
- Porsche 993 (911) C2S 1994-97
- Porsche 993 (911) C4S 1994-97
The OE Match exhaust valve set includes six precision-engineered exhaust valves designed for Porsche 911 (993) Carrera models with early 3.6L engines. These valves are installed in the cylinder heads and regulate the release of exhaust gases from the combustion chambers into the exhaust system.
SET OF 6 exhaust valves
Fits:
Porsche 993 C2 / C4 3.6L 1993 - 1995
* with Engine codes: M64.05 / M64.06 / M64.07 / M64.08
Diagram Ref No 10
Exhaust valves are key components of the engine valve train. Each valve sits within the cylinder head and opens when actuated by the camshaft to allow combustion gases to exit the cylinder.
This OE Match set provides six valves, which corresponds to the number of exhaust valves used in the flat-six Porsche 993 engine. These valves are manufactured to meet OEM-level standards and feature the correct valve head size and stem dimensions required for the Porsche M64 engine family.
The set is ideal for cylinder head refurbishment, engine rebuilds or valve train servicing, ensuring consistent performance across all cylinders.
The exhaust valves open during the exhaust phase of the combustion cycle to release burnt gases from the cylinder. They then close tightly to seal the combustion chamber during the compression and power strokes.
Correctly functioning valves are essential for maintaining engine compression, efficient combustion and overall engine performance.
Exhaust valves operate under extremely high temperatures and continuous mechanical stress. Over time they may wear, warp or suffer from carbon buildup, which can lead to compression loss, poor engine performance or valve train noise. Replacing worn valves during engine service or rebuild ensures proper combustion sealing and reliable engine operation.
Consider replacing the exhaust valve if you notice:
• Loss of compression or engine power
• Excessive valve train noise
• Burnt or worn valve surfaces
• During cylinder head rebuild or engine overhaul
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
99310541901
The product you are viewing cross references to these numbers
This kit is comprised of the following items:
- Porsche 993 (911) C2 1994-97
- Porsche 993 (911) C4 1994-97
- Porsche 993 (911) RS 1994-97
- Porsche 993 (911) C2S 1994-97
- Porsche 993 (911) C4S 1994-97
This is a set of six OE Match quality exhaust valve guides designed for the air-cooled Porsche 911 (993) engines produced between 1994 and 1998. These are 1st oversize valve guides, meaning they are slightly larger than standard guides to accommodate engines that have been reamed or show wear in the original guide bores. The set contains six guides, enough for a full cylinder head rebuild on the exhaust side.
SET OF 6
Fits:
Porsche 993 1994 - 1998
Diagram Ref no 2.
Valve guides are precision metal bushings pressed into the cylinder head that support and guide the movement of the exhaust valve stems. Over time, original guides can wear, allowing excessive valve stem play, reducing seal effectiveness, and increasing engine oil consumption. These OE Match valve guides are manufactured to match Porsche’s original specifications, including diameter, material quality and machining tolerance, but in a 1st oversize dimension so they fit reamed cylinder heads.
This SET OF 6 provides a complete set for one engine’s exhaust side - ideal for cylinder-head rebuilds, valve jobs or whenever the exhaust guide bores are undersized due to wear.
The exhaust valve guides:
• Support and align the exhaust valve stems so they travel accurately within the head.
• Maintain correct valve seating and combustion sealing, which is vital for performance and compression.
• Help conduct and dissipate heat from valves into the cylinder head casting.
• Reduce lateral valve stem movement, decreasing wear on stems and valve seats.
By replacing old or worn guides with a matched oversize set, you can restore tight tolerances in the valve train and help ensure efficient combustion and long-term reliability.
Valve guides wear over time due to heat, friction, and repeated valve movement. When guides become worn or oversized gaps develop between the valve stem and guide bore, the following issues can arise:
• Loss of performance and power
• Higher oil consumption
• Reduced sealing and compression
• Increased valve train wear
Installing a correct OE Match valve guide restores correct valve alignment, reduces unwanted movement, supports proper seat sealing, and prolongs the life of your engine’s top end - especially in rebuild or high-mileage applications.
Replace valve guides if you observe:
• Blue smoke from the exhaust (signifying oil burning)
• Rough idle or hesitation
• Poor compression or loss of engine power
• Valve stem play when checked during teardown
• During a cylinder head rebuild or valve job
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
99310432172
The product you are viewing cross references to these numbers
This kit is comprised of the following items:
- Porsche 993 (911) C2 1994-97
- Porsche 993 (911) C4 1994-97
- Porsche 993 (911) RS 1994-97
- Porsche 993 (911) C2S 1994-97
- Porsche 993 (911) C4S 1994-97
- Porsche 993 (911) TURBO 1994-96
- Porsche 993 (911) GT2 1994-97
- Porsche 993 (911) TURBO S 1994-97
This set of 6 intake valve guides (1st oversize) is designed for professional cylinder-head rebuilds on Porsche 993 air-cooled flat-six engines. Manufactured to match original Porsche dimensions, material specifications, and hardness ratings, these guides ensure the intake valves operate with correct alignment, stability, and sealing performance - all essential for maintaining proper combustion and long-term engine reliability.
SET OF 6
Fits:
Porsche 993 1994 - 1998
Diagram Ref no 3.
• Use Cases: Head rebuilds; valve-seat re-cut; restoring compressed guide bores; upgrading worn or damaged valve guides; preventive maintenance where valve guide integrity is uncertain.
Oversize valve guides are used when the cylinder-head guide bores have worn or been machined during refurbishment. This set provides a complete, matched group of intake guides, ensuring uniform fitment and valve control across all cylinders. With precision-machined tolerances and excellent heat resistance, these OE-match guides restore the valve train to factory behaviour, eliminating excessive valve play and preventing compression loss, misfires or premature wear.
Perfect for engine rebuilders, restorers, and anyone refreshing a 993 cylinder head, this set supports smooth, accurate valve movement and optimal sealing under the high temperatures and RPM conditions typical of Porsche’s air-cooled performance engines.
Valve guides endure constant thermal cycles, valve-spring force, and high-speed motion. Over time they can wear, enlarge, or become loose - causing:
• Valve wobble and mis-alignment
• Poor sealing at valve seats - resulting in compression loss, misfires, or exhaust leakage
• Increased valve-stem wear, potential seat damage, or premature engine wear
• Reduced engine efficiency, elevated emissions, and unsafe reliability.
Replacing worn or oversized guides with a proper unit restores correct valve operation, extends cylinder-head life, ensures compression integrity, and brings the engine back to spec - critical for performance, reliability, and longevity.
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
99310432271
The product you are viewing cross references to these numbers
This kit is comprised of the following items:
- Porsche 993 (911) C2 1994-97
- Porsche 993 (911) C4 1994-97
- Porsche 993 (911) RS 1994-97
- Porsche 993 (911) C2S 1994-97
- Porsche 993 (911) C4S 1994-97
- Porsche 993 (911) TURBO 1994-96
- Porsche 993 (911) GT2 1994-97
- Porsche 993 (911) TURBO S 1994-97

Fits:
Porsche 993 C2 / C4 3.6L 1994-97
Click 'Zoom in' for large parts diagram.
Diagram Ref No 13.
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
99310590151
The product you are viewing cross references to these numbers
This kit is comprised of the following items:
- Porsche 993 (911) C2 1994-97
- Porsche 993 (911) C4 1994-97
- Porsche 993 (911) RS 1994-97
- Porsche 993 (911) C2S 1994-97
- Porsche 993 (911) C4S 1994-97
- Porsche 993 (911) TURBO 1994-96
- Porsche 993 (911) GT2 1994-97
- Porsche 993 (911) TURBO S 1994-97
The valve stem seal, OEM part number 993 104 111 02 (sometimes superseding 993 104 111 01), is a component for the Porsche 993 series.
These seals are installed around the valve stems and serve to regulate, not entirely block, oil flow into the combustion chamber. They wipe excess oil off the valve stems and prevent undue oil burning or plug fouling. They are applicable across various 993 configurations—including the naturally aspirated Carrera and the Turbo variants—for 1994–1998 models.
Fits:- Porsche 993 (911) C2 1994-97
- Porsche 993 (911) C4 1994-97
- Porsche 993 (911) RS 1994-97
- Porsche 993 (911) C2S 1994-97
- Porsche 993 (911) C4S 1994-97
- Porsche 993 (911) TURBO 1994-96
- Porsche 993 (911) GT2 1994-97
- Porsche 993 (911) TURBO S 1994-97
Why You Should Replace Them
Over time, valve stem seals, typically rubber or elastomeric, can harden, crack, or shrink, especially under high heat and engine age—which compromises their sealing effectiveness.
Visible Symptoms:
- Blue exhaust smoke, particularly upon a cold start—leftover oil seeps past hardened seals and burns in the combustion chamber.
- Increased oil consumption without noticeable external leaks, as oil is being burned rather than escaping visibly.
- Smoke or puffing at idle or after deceleration, when high vacuum draws oil past failing seals.
- Compression or misfiring issues—oil-fouled spark plugs can disrupt ignition, and carbon buildup may mimic compression loss.
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
99310411102
The product you are viewing cross references to these numbers
This kit is comprised of the following items:
- Porsche 993 (911) RS 1994-97

Fits:
Porsche 911 (993) 3.8 Carrera RS 1995-96 (M64.20)
Click 'Zoom in' for large parts diagram.
Diagram Ref No 10
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
99310541943
The product you are viewing cross references to these numbers
- Porsche 993 (911) C2 1994-97
- Porsche 993 (911) C4 1994-97
- Porsche 993 (911) C2S 1994-97
- Porsche 993 (911) C4S 1994-97
The OE Match exhaust valve is a precision engine component designed for Porsche 911 (993) Carrera models equipped with early 3.6L engines. It is installed in the cylinder head and forms part of the valve train responsible for controlling the flow of exhaust gases from the combustion chamber to the exhaust system.
Sold individually, 6 required per vehicle
Fits:
Porsche 993 C2 / C4 3.6L 1993 - 1995
* with Engine codes: M64.05 / M64.06 / M64.07 / M64.08
Diagram Ref No 10
The OE Match version of part number 99310541901 is designed for pre-Varioram Porsche 993 engines used in early Carrera models. It is engineered with the correct stem diameter, valve head size and material specification to withstand the extreme temperatures and stresses experienced in high-performance air-cooled engines.
The exhaust valve regulates the release of burnt gases from the combustion chamber. When opened at the correct time by the camshaft, it allows exhaust gases to exit the cylinder and enter the exhaust system, preparing the chamber for the next intake cycle.
Maintaining properly functioning valves is essential for efficient combustion, engine power and reliable operation.
Exhaust valves operate under extremely high temperatures and continuous mechanical stress. Over time they may wear, warp or suffer from carbon buildup, which can lead to compression loss, poor engine performance or valve train noise. Replacing worn valves during engine service or rebuild ensures proper combustion sealing and reliable engine operation.
Consider replacing the exhaust valve if you notice:
• Loss of compression or engine power
• Excessive valve train noise
• Burnt or worn valve surfaces
• During cylinder head rebuild or engine overhaul
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
99310541901
The product you are viewing cross references to these numbers
- Porsche 993 (911) C2 1994-97
- Porsche 993 (911) C4 1994-97
- Porsche 993 (911) RS 1994-97
- Porsche 993 (911) C2S 1994-97
- Porsche 993 (911) C4S 1994-97

Fits:
Porsche 993 C2/C4 3.6L 1996-98
911 (993), 3.6 Carrera M64.21 / M64.22 / M64.23 / M64.24
Valve head diameter 43,50 mm
Valve stem diameter 8,00 mm
Valve shaft length 109,00 mm
Valve seat angle 45 °
Click 'Zoom in' for large parts diagram.
Diagram Ref No 10.
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
99310541906
The product you are viewing cross references to these numbers
- Porsche 993 (911) RS 1994-97

Fits:
Porsche 993 Carrera RS - 1995 to 1998
Click 'Zoom in' for large parts diagram.
Diagram ref no 10
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
99310541983
The product you are viewing cross references to these numbers
- Porsche 993 (911) TURBO 1994-96
- Porsche 993 (911) TURBO S 1994-97

Fits:
Porsche 993 Turbo 3.6L 1995-98 (M64.60)
Click 'Zoom in' for large parts diagram.
Diagram Ref No 10.
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
99310541952
The product you are viewing cross references to these numbers
- Porsche 993 (911) RS 1994-97

Fits:
Porsche 911 (993) 3.8 Carrera RS 1995-96 (M64.20)
Click 'Zoom in' for large parts diagram.
Diagram Ref No 9
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
99310540942
The product you are viewing cross references to these numbers
- Porsche 993 (911) C2 1994-97
- Porsche 993 (911) C4 1994-97
- Porsche 993 (911) TURBO 1994-96
- Porsche 993 (911) TURBO S 1994-97

Fits:
Porsche 993 C2/C4 3.6L 1994-95
Porsche 993 Turbo 1995-98
911 (993) 3.6 L M64.05
911 (993) 3.6 L M64.06
911 (993) 3.6 L M64.07
911 (993) 3.6 L M64.08
911 (993) 3.6 L M64.60 TURBO
Inlet Valve. Valve Head Ø: 49 mm, Valve Stem Ø: 8 mm, Valve Shaft Length: 110 mm, Valve Seat Angle: 45 °
Click 'Zoom in' for large parts diagram.
Diagram Ref No 9.
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
99310540902
The product you are viewing cross references to these numbers
- Porsche 993 (911) C2 1994-97
- Porsche 993 (911) C4 1994-97

Fits:
Porsche 993 C2 / C4 3.6L 1996-98
M64.21
M64.22
M64.23
M64.24
Click 'Zoom in' for large parts diagram.
Diagram Ref No 9.
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
99310540502
The product you are viewing cross references to these numbers
- Porsche 993 (911) TURBO 1994-96
- Porsche 993 (911) GT2 1994-97
- Porsche 993 (911) TURBO S 1994-97
6 per engine. Price is for each.

Fits:
Porsche 993 Turbo 1994-98
Engine Type M64:60
Material: Bronze
Inner diameter: 8,00 mm
Outer diameter: 13,05 mm
Length: 45,40 mm
Click 'Zoom in' for large parts diagram.
Diagram Ref no 2.
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
99310432161
The product you are viewing cross references to these numbers
- Porsche 993 (911) C2 1994-97
- Porsche 993 (911) C4 1994-97
- Porsche 993 (911) RS 1994-97
- Porsche 993 (911) C2S 1994-97
- Porsche 993 (911) C4S 1994-97
OE Match Exhaust Valve Guide is a precision-engineered valve guide designed to replace the original exhaust valve guide in the Porsche 911 (993) engine. This is a 1st oversize guide - meaning it is slightly larger than standard to accommodate engines that have been reamed or experienced wear over time.
Price is for each, 6 required per engine.
Fits:
Porsche 993 1994 - 1998
Diagram Ref no 2.
This exhaust valve guide keeps the exhaust valve stem perfectly aligned in the cylinder head, helping to ensure the valve seals correctly against the seat, maintains good compression, and promotes efficient evacuation of exhaust gases. A proper valve guide also helps conduct heat away from the valve stem into the head where it can be cooled by the engine’s coolant system.
Function:
• Valve Alignment: Ensures the exhaust valve travels straight and seats accurately each cycle.
• Wear Control: Reduces valve stem wobble and limits side loading that can damage seats or stems.
• Heat Conduction: Helps transfer combustion heat away from the valve stem and into the head casting.
• Rebuild Support: Oversize version is ideal for heads that have been reamed during rebuilds to restore correct fitment.
Fitment
• Installed in the exhaust sides of the cylinder head valve train
• Typically 6 guides per engine are needed for a full head rebuild.
• This part matches Porsche’s oversize guide specification and is used when the standard guide bores have been worked to remove wear or damage.
Valve guides wear over time due to heat, friction, and repeated valve movement. When guides become worn or oversized gaps develop between the valve stem and guide bore, the following issues can arise:
• Loss of performance and power
• Higher oil consumption
• Reduced sealing and compression
• Increased valve train wear
Installing a correct OE Match valve guide restores correct valve alignment, reduces unwanted movement, supports proper seat sealing, and prolongs the life of your engine’s top end - especially in rebuild or high-mileage applications.
Replace valve guides if you observe:
• Blue smoke from the exhaust (signifying oil burning)
• Rough idle or hesitation
• Poor compression or loss of engine power
• Valve stem play when checked during teardown
• During a cylinder head rebuild or valve job
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
99310432172
The product you are viewing cross references to these numbers
- Porsche 993 (911) C2 1994-97
- Porsche 993 (911) C4 1994-97
- Porsche 993 (911) RS 1994-97
- Porsche 993 (911) C2S 1994-97
- Porsche 993 (911) C4S 1994-97
- Porsche 993 (911) TURBO 1994-96
- Porsche 993 (911) GT2 1994-97
- Porsche 993 (911) TURBO S 1994-97
This is a replacement intake valve guide - the small, cylindrical bushing within the cylinder head that guides the intake valve stem, ensuring correct alignment and smooth, controlled movement as the valve opens and closes. In some rebuild or re-machining scenarios, oversized guides are used to restore proper fit after head work.
Price is for each, 6 required per engine.
Fits:
Porsche 993 1994 - 1998
Diagram Ref no 3.
• Use Cases: Head rebuilds; valve-seat re-cut; restoring compressed guide bores; upgrading worn or damaged valve guides; preventive maintenance where valve guide integrity is uncertain.
• Supplied individually - multiple guides needed per head depending on engine (one per intake valve).
This valve guide keeps the intake valve moving in perfect alignment, ensuring proper sealing, efficient combustion, and stable engine performance. It supports the valve stem to prevent wobble or side movement that can cause uneven seat wear or loss of compression. Designed to withstand high RPM and heat, it promotes smooth valve operation and protects the valve, seat, and cylinder-head surfaces. As an oversize guide, it also restores correct fit in worn or re-machined heads, ensuring a safe and reliable rebuild.
Valve guides endure constant thermal cycles, valve-spring force, and high-speed motion. Over time they can wear, enlarge, or become loose - causing:
• Valve wobble and mis-alignment
• Poor sealing at valve seats - resulting in compression loss, misfires, or exhaust leakage
• Increased valve-stem wear, potential seat damage, or premature engine wear
• Reduced engine efficiency, elevated emissions, and unsafe reliability.
Replacing worn or oversized guides with a proper unit restores correct valve operation, extends cylinder-head life, ensures compression integrity, and brings the engine back to spec - critical for performance, reliability, and longevity.
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
99310432271
The product you are viewing cross references to these numbers
OEMatch Engine Valves / Guides / Springs — Durability, Sealing, Performance
OEMatch supplies a selection of engine valves, valve guides and valve springs for Porsche models. These cylinder head components control air intake, exhaust flow and valve timing. Installing correct parts helps restore compression, reduce oil consumption and maintain consistent combustion across classic air-cooled flat-sixes and modern water-cooled engines.
Available Types
- Inlet (intake) valves
- Exhaust valves
- Valve guides
- Valve springs and retainers
- Valve seats and shims
Understanding OEMatch Engine Valves / Guides / Springs
OEM (Original Equipment Manufacturer) parts are made by the same company that produced your Porsche’s original engine valves / guides / springs.
OE (Original Equipment) refers to parts matching original specifications for the engine valves / guides / springs and may be supplied by alternative manufacturers. Aftermarket parts offer alternative options, sometimes with enhanced features or better value. OEMatch supplies non-OEM engine valves / guides / springs engineered as direct-fit alternatives to OEM parts, made to original-spec dimensions and tolerances for Porsche models.
Valves, guides and springs together control airflow into and out of the combustion chamber, maintain valve alignment and close valves with the correct force. Worn or incorrectly matched components affect sealing, timing and engine smoothness; correct selection is important for reliable operation and long-term durability. OEMatch catalogues a wide range of Porsche items, with several thousand part numbers and extensive cross-references to support rebuilds and restorations.
Benefits Include
- Restores correct airflow and combustion sealing for improved compression
- Reduces oil consumption and exhaust smoke by renewing worn guides and seals
- Eliminates valve float and restores high-RPM stability with appropriate spring rates
Why Engine Valves / Guides / Springs Wear and Fail
- Valve seat wear or pitting that reduces sealing and compression
- Burnt or bent valves from overheating or incorrect timing
- Worn valve guides causing increased clearance, oil consumption and smoke
- Fatigued or weakened valve springs leading to valve float at high engine speeds
- Corrosion and carbon build-up from poor fuel quality or many short trips
The Importance of Replacing with OEMatch Engine Valves / Guides / Springs
Timely replacement of valves, guides and springs preserves engine compression, throttle response and fuel efficiency. Renewing these components during a head rebuild or scheduled overhaul prevents secondary damage to pistons and seats, helps maintain emissions performance and keeps the engine running smoothly under load. Choosing parts selected for Porsche applications supports correct clearances, spring rates and material properties needed across different model years and engine types.
Advantages
- Direct-fit alternatives engineered to match original dimensions and tolerances where applicable
- Options suitable for restorations, routine overhauls and performance maintenance
- Components chosen for heat resistance and fatigue life to suit Porsche cylinder head conditions